INFLUENCE OF LOCALITY AND WAY OF TRANSMISSION ON SPREADING INTENSITY OF SOME POTATO VIRUSES

摘要

In the course of 1991 and 1992 spreading intensity of potato virus Y (PVY), potato leaf roll virus (PLRV) and potato virus X (PVX) in the localities with different intensity of infection was investigated. At the same time, monitoring flight of leaf aphids by the method of yellow traps and their identification was carried out in the same localities. The results of the investigation proved that the spreading intensity of PVY was highest, considerably poorer of PLRV, while at the same time there were no plants infected by PVX. The most severe average infection by PVY was in the localities of high occurence of infection (Vranjica and Kaona) and it was 54,% and 47,4% and at Javor 2,9% while the infection by PLRV was 3,5%, 4,6% and 0,7% respetively as follows. No infection by PVX was detected. The most numerous aphids at Vranjica are: Phorodon humuli, Aphis sp., Aphis craccivora, Aphis idaei, Phyllaphis fagi, Protrama spp., and on Javor Acyrtosiphonpisum, Aphis cmccivora, Aphis fabae, Aphis sp., Brachycaudus helychrisi, Brachycaudus spp., Cryptomyzus ribs, Megoura vide, Phyllaphis fagi, Sitobion avenae und Uroleucom spp. In all these localities the occurence of Myzus persicae was detected.